i've done 3 body lifts, 1 on a 2500 chevy and 2 on 1500 chevys all we're 3" and to be honest, the stock tires on those trucks looked fine, and those tires were all 265 75 16's on a much bigger truck, id keep the ones that are on there for right now until they wear out or until you come across a deal on a set. body lifts pretty straight forward, pretty much what YellowKota2k is all that really goes into it, just watch your brake lines and wiring as you lift the truck off the frame. also when you unbolt the body, only unbolt one side at a time i.e. if your going to do the cab first, only unbolt the drivers side bolts first, but loosen the passenger side, then slide the blocks in and hand tighten the bolts. then do the passenger side, that way there is no way of the body moving around and causing you to have to re-align everything back up. good luck with the lift..good luck with it and post lots and lots of pictures! :mullet: